Process of making paper.



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To all whom it may concern:

Be it known that l, "WrtLrAM H. Goon .nn'ouen', a citizen of the United States, re-

siding at Oamas, in the county of Clarke and State of Washington, have invented new and useful Improvements in Processes of Makinglaper, of which the following is a specification.

This invention relates to a. method wherein an alkali is introduced into the paper making stock and has for its object to make the stud run better on the machine, screening much more freely and causing less breaks as the web goes through the presses; also to-render the sheet capable of taking a superior finish. It avoids the use of all size. It relates particularly to news print paper, the finished product taking cuts 1 and prints much better than a sheet whose fibers have not been so treated.

In the process of making newsprint paper, the ground wood stock and the sulfite stock are usually mixed in the proper proportions and beaten in a heater engine and it is at this point in the paper making process that I introduce two pounds of salsoda into approximately fifteen hundred pounds of paper stock thus mixing it intimately with the paper making fibers. In mills which use the tank system andhave discarded the heaters, the proper amount of sal-soda can he added in the mixing tanks whose agitators will difiuse. the soda throughout the stuflfl While I have attained the best results with sal-soda and prefer to use. sodium in that form, yet soda-ash, caustic soda and the like can be used with satisfactory results.

It is a source. of constant trouble'on the screens of a paper machine that strings of pulp fiber form which work into the pulp stock and cause lumps which result-in frequent breaking of the tender web of paper as it goes through the presses of the ma-' specification of Letters latent.

lEatented Mar. a, rare.

Application filed August 29, 1917. Serial No. 188,791.

chine. I have discovered that fibers treated with an alkali as above set forth, will through the screens much more freely and with much less tendency to form strings, so that lorealn-i" from. this cause on the paper machine are reduced to a minimum. and the output of the machine increased. Also the felting quality of the fibersis improved, forming a closer sheet, which takes an improved finish from thecalendci ing. The improvement in finish is marked. and the usual sizing may be omitted, effecting' a reduction of cost. When the ground wood or the sulfite stock has rosin or pitch in it the sodium acts as a corrective and trouble from this source is avoided.

I claim 1. In the process of making news-print paper the addition of two pounds of sal" soda to fifteen hundred pounds of paper stoc 2. In the process of making news-print paper stock.

3. In the process of making newsprint paper the addition in the mixing tank of approximately two pounds of sal-s 'da to approximately every fifteen hundred pounds of paper stock.

4. In the'process of making newsprint paper the addition of approximately two pounds of an alkali to approximately every fifteen hundred. pounds of paper stock.

.' 5. Paper impregnated with an alkali,

there being about .0013?;% of said alkali added to the paper. material during-the process of manufacture.

' 6.- In the process of, making newsprint paper the addition of an alkali to the paper stock,

W. H. GOQDENOUGH. 

